I've always thought it should be possible to install an Xwhatsit controller into an IBM Model F XT if the original controller was cut off and directly wired to the existing traces. This is the proof of concept and it works great! To make the video more interesting, I hooked up an old solenoid driven bell from an IBM typewriter that I had laying around. Makes for the loudest USB powered keyboard I've ever experienced!

Story behind this one is that I came across some Model F XT's that had some sort of third-party-modification to the original controllers and they do not work with modern converters because of this. It was either junk the PCB or test out my old theory. Basically just cut the original controller off with a Dremel. Upside down mounting of the Xwhatsit made more sense since this was the orientation of the traces and it happens to divert the USB cable in the direction where there is more free space in the case anyway. The assembly does fit in the case just fine as pictured without any issues, just couldn't fit the bell in there!

Close up of Xwhatsit for wiring purposes should you want to try this at home:

Amazing! How did you performed such a clean cut over the areas with the copper mask?

Just used a Dremel with a cutting wheel attachment actually. I think you could probably also use a bench grinder, but grinding the entire controller off would probably make a lot more potentially harmful dust